opensearch support status

[sebix]

@tgoti

Since that was what I had installed and the update to 6.5 did not work anymore with that version.
In the index “zammad_production_chat_session” there is a flattend field requirement which does let the reindex fail.
It does not work with the old ElasticSearch 7.x and also the old OpenSearch <3.0.

FWIW, this issue got its own thread: Zammad 6.5 – Search Index Fails on Elasticsearch OSS 7.10.2 Due to flattened Field Type